Rebutting the lack of healing with the one healing ability is missing the point.
DAI lacking heals is NOT a flaw, it's a different design. It's not like DAI takes the DAO combat and removes all the healing spells, so either you use potions or you die. It's not that at all, instead they added a whole new system of "temporary" hit points to compensate, with Barrier and Guard. This adds a completely different dimension to the combat, where you need to manage your temporary health to minimize battle attrition.
Of course, it also adds a completely different dynamic to encounter design: battles in DAI are no longer design to wipe the party at every turn. Rather, the challenge is in minimizing attrition, so as to be able to handle later encounters.
Quite frankly, I think those who complain about the lack of healing are doing it wrong. They're fighting like they're playing DAO or DA2, instead of fighting as they should be. It's a complete paradigm shift, quite frankly, and one that looks very interesting: instead of fighting and then healing your characters, you must defend your characters and THEN fight.
It's proactive combat instead of reactive, and I have a feeling people who complain about healing just haven't adjusted yet.